A positive QFT-GIT was defined as a TB antigen minus nil (negative control) value ≥0.35 IU/ml and ≥25% of nil value. A nil value of >8.0 IU/ml or a mitogen minus nil of <0.5 IU/ml was classified as indeterminate. QFT-GIT conversion or reversion was defined as respectively a neg...
A positive QFT-GIT was defined as a TB antigen minus nil (negative control) value ≥0.35 IU/ml and ≥25% of nil value. A nil value of >8.0 IU/ml or a mitogen minus nil of <0.5 IU/ml was classified as indeterminate. QFT-GIT conversion or reversion was defined as respectively a neg...
In this group of patients (15/60) the average level of INF-γ in the tube of TB Antigen minus Nil was 0,082 IU/ml and in the tube of Mitogen minus Nil 11,154 IU/ml before QFT conversion. We observed an increase of INF-γ levels after QFT conversion during the biological treatment...